Chemistry: analytical and immunological testing – Food or dairy products
Patent
1994-06-24
1997-09-02
Snay, Jeffrey
Chemistry: analytical and immunological testing
Food or dairy products
436 21, 436128, 436167, 436169, G01N 3312, G01N 2131
Patent
active
056630727
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a method of detecting food (including beverage) spoilage and is particularly, although not exclusively, concerned with the detection of spoilage in chilled foodstuffs, such as red meats, during processing, transportation and/or storage.
BACKGROUND OF THE INVENTION
The monitoring and control of the condition of fresh foodstuffs, which have been given enhanced, but not indefinite, shelf life by chilling and refrigerated storage, poses a major problem in our health conscious society. Thus the consumer demands fresh food, conveniently packaged, and with all-the-year round availability in shops and supermarkets, while at the same time insisting that there is no danger of spoilage leading to impaired looks or flavour, or, more importantly, health risk, in the purchased foods.
Oxidation of lipids, nucleotide degradation by endogenous enzymes and bacterial growth processes involving the metabolism of a wide range of food constituents including carbohydrates and amino acids can all contribute to losses in sensory qualities of foods and their ultimate rejection by the consumer. The relative importance of these various spoilage processes may vary from product to product, with conditions of transportation and storage, with intended use etc., but the consequences of bacterial growth are commonly an important contributory factor. This is especially the case for chilled-fresh foods.
Determinations of the extent and/or precise nature of spoilage may be required for routine quality assurance, for regulatory purposes or for establishing the cause for any particular condition and hence appropriate remedial action. Sensory and microbiological criteria are traditionally used for these purposes, but both have their limitations. The subjectivity of sensory data poses many problems in routine use, not least because of the difficulties in assigning meaningful criteria for differentiating "acceptable from non-acceptable" (or "spoiled from non-spoiled") product. While total bacterial numbers often bear some relationship to acceptability, there are still problems in their use. Not all bacteria growing on food necessarily contribute to spoilage, nor is there a consistent relationship between bacterial numbers and spoilage. Thus, high pH meat (dark, firm, dry: DFD), spoils at lower cell densities than normal-pH meat under identical storage conditions whereas, on vacuum-packaged meat, bacterial numbers may reach a maximum and then remain unchanged for significant periods without obvious sensory change.
Measurement of chemical change, whether of microbial or non-microbial origin, offers a possible alternative to microbiological and sensory criteria. For example, an electrochemical method for glucose and enzyme sensors for nucleotide degradation products and for certain amines have already been proposed.
It has been found by Dainty et al., J. Appl. Bact., (1985), 59, 303-309 and J. Appl. Bact., (1989), 66, 281-289 that the volatile compound diacetyl (butane 2,3-dione) is produced during chill storage of red meats with free access to air (through a permeable film overwrap) or in high O.sub.2 /CO.sub.2 gas atmospheres, and that diacetyl has a high potential as an index of freshness/acceptability/spoilage. This compound has been detected consistently during storage, and at relatively early stages when sensory changes were restricted to development of staleness rather than obvious spoilage. Evidence indicating that accumulation may also occur in vacuum packs has also been suggested as a measure of the condition of some citrus fruit juices and the sanitary status of the processes used in their manufacture, and as a means of detecting supplementation of aroma constituents to mask organoleptic defects in butter. Diacetyl has also been employed as an additive in the manufacture of margarine and cheese. Additionally it is produced during yeast fermentation and plays a role in the flavouring of beer. Sensitive, rapid methods for detection and analysis of diacetyl, which can be applied on- or at-line, to monitor food man
REFERENCES:
patent: 4285697 (1981-08-01), Neary
patent: 5310682 (1994-05-01), Novotny et al.
Ishida, J. et al. "4,5-Diaminophthalydrazide as a highly sensitive chemiluminescence derivatization reagent for a-dicarbonyl compounds in high-perfromance liquid chromatography" Journal of Chromatography, vol. 598 (1992) pp. 203-208.
Maroulis, A.J. "Flurometric Determination of Biacetyl" Talanta, vol. 32, No. 6 (1985) pp. 504-506.
DePablo, B. et al. "The D(-)lactic acid and acetoin/diacetyl as potential indicators of the microbial quality of vacuum-packed pork and meat products" Journal of Applied Bacteriology, vol. 66 (1989) pp. 185-190.
Pietro, D. et al. "Determination of diacetyl in butter as 2,3-diaminonaphthalene derivative, using a fluorometric procedure or reverse phase liquid chromatography with fluorescence detection" Chemical Abstracts, vol. 109 (1988) Abstract No. 91320n.
Iwaida, M. et al. "Studies on the determianation of the aroma compounds produced by Streptococcus diacetilactis" Chemical Abstracts, vol. 68 (1968) Abstract No. 67827x.
Iwaida, M. et al. "The diacetyl and ethanol contents of commercial venegars and composite products containing vinegar" Chemical Abstracts, vol. 93 (1980) Abstract No. 44135x.
G. Sadler et al. "Diacetyl measurement in orange juice . . . " Journal of Food Science, vol. 55 No. 4, 1990, pp. 1164-1165.
R. H. Dainty et al. "Time course of volatile compound . . . " Journal of Applied Bacteriology, vol. 59 No. 4, Oct. 1985, Oxford, GB, pp. 303-309.
R.H. Dainty et al. "Time course of volatile compound . . . " Journal of Applied Bacteriology, vol. 66 No. 4, Apr. 1990, Oxford, GB, pp. 281-289.
Chemical Abstracts, vol. 110 No. 13, 27 Mar. 1989, Columbus, Ohio US, #113300. Estepa et al. "Spectrophotometric determination . . . ", p. 565.
Chemical Abstracts, vol. 113 No. 21. 19 Nov. 1990, Columbus, Ohio US, #191592, Choo et al. "A new type of organocobalt complex . . . ", p. 747.
Chemical Abstracts, vol. 103 No. 15, 14 Oct. 1985, Columbus, OH US, #119176, Duenas et al. "Specific nuclear staining of leukocytes . . . ", p. 356.
Database WPI, Section Ch. Week 8038, 29 Oct. 1980, Derwent Publications Ltd., London, GB, Class G, p. 7.
British Technology Group Ltd
Snay Jeffrey
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